<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div class="header">头部</div>
<div class="main">
    <div class="sidebar">侧边栏</div>
    <div class="content">主要内容区</div>
</div>
<div class="footer">底部</div>

</body>
</html>